CN113520440B - Cardiac CT scanning detection device and cardiac CT scanning reconstruction method - Google Patents
Cardiac CT scanning detection device and cardiac CT scanning reconstruction method Download PDFInfo
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Abstract
The embodiment of the application provides a heart CT scanning detection device and a heart CT scanning reconstruction method, wherein the heart CT scanning detection device comprises a first detector component, a second detector component and a third detector component, the first detector component is arranged in a central area, the second detector component and the third detector component are respectively arranged in a first peripheral area and a second peripheral area which are arranged at two sides of the central area, and the central area corresponds to a heart scanning area; the first detector assembly includes a plurality of detectors arranged in series to completely cover the central region; the second detection assembly and the third detection assembly respectively comprise a plurality of detectors which are arranged continuously or at intervals so as to partially cover the corresponding peripheral areas. According to the technical scheme, the cardiac CT scanning detection device is improved in structure, so that the product cost is greatly reduced, the radiation dose is effectively reduced, and the like under the condition that a good CT scanning reconstruction result is ensured.
Description
Technical Field
The application relates to the technical field of CT scanning, in particular to a heart CT scanning detection device and a heart CT scanning reconstruction method.
Background
In the field of CT medical imaging, CT scanning speeds vary from the first few minutes to the current 0.2 seconds, and detector rows range from the first single row to the current 64 rows, 128 rows, even 256 rows, and so on. For the scanning site, it is also possible to perform only a conventional head scan from the beginning, to a subsequent chest and abdomen scan, and to a current cardiac CT scan.
For cardiac scanning, due to the periodicity and irregularity of the motion of the heart, gating scanning of the heart is generally required, that is, scanning images of a fixed cardiac time interval of the heart according to an electrocardiographic waveform of the heart can ensure that the motion of the heart is minimum, and an optimal cardiac CT image is obtained. Currently, cardiac scanning generally employs a CT system with a high number of rows of detectors, such as 128 rows and 256 rows of detectors, and although scanning of the entire heart can be accomplished in less than 0.3 seconds, the disadvantage of this approach is the high cost of the detectors.
Disclosure of Invention
The embodiment of the application provides a heart CT scanning detection device and a heart CT scanning reconstruction method, and the heart CT scanning detection device can greatly reduce the product cost and the like under the condition of obtaining a required CT scanning reconstruction structure by structurally improving the heart CT scanning detection device.
The embodiment of the application provides a heart CT scanning detection device, which comprises a first detector assembly, a second detector assembly and a third detector assembly, wherein the first detector assembly is arranged in a central area, the second detector assembly and the third detector assembly are respectively arranged in a first peripheral area and a second peripheral area which are arranged at two sides of the central area, and the central area corresponds to a heart scanning area;
The first detector assembly includes a plurality of detectors arranged in series to completely cover the central region; the second detection assembly and the third detection assembly respectively comprise a plurality of detectors which are arranged continuously or at intervals so as to partially cover the corresponding peripheral areas.
In one embodiment, the first detector assembly includes a plurality of high-row-number detectors arranged in a horizontal succession and side-by-side relationship.
In one embodiment, the cardiac CT scanning detection device is an axial scanning detection device, and the second detection assembly and the third detection assembly each include a low-row number detector located on a horizontal central axis and a plurality of high-row number detectors arranged at intervals in a direction perpendicular to the horizontal central axis.
In one embodiment, the plurality of high-rank detectors are arranged symmetrically up and down or staggered up and down along the horizontal central axis.
In an embodiment, the cardiac CT scanning detection device is an axial scanning detection device, and the second detection assembly and the third detection assembly respectively include a group of high-row-number detectors continuously disposed along a horizontal central axis direction and located at one side of the horizontal central axis, and the two groups of high-row-number detectors are diagonally symmetrical with the central area as an origin.
In one embodiment, the cardiac CT scanning detection device is a spiral scanning detection device, and the second detection component and the third detection component each include only one low-row detector located on a horizontal central axis, and the two low-row detectors are symmetrically arranged with the central area as an origin.
The embodiment of the application also provides a heart CT scanning reconstruction method, which comprises the following steps:
the heart CT scanning detection device is utilized to scan the heart according to a corresponding scanning mode, so as to obtain scanning projection data;
Performing data estimation according to a preset rule corresponding to the scanning mode based on the scanning projection data to obtain estimated projection data;
and carrying out scanning reconstruction on the heart based on the scanning projection data and the estimated projection data to obtain a heart reconstruction image.
In one embodiment, the scan projection data is obtained based on a spiral scan detection apparatus, which includes two low-rank detectors respectively located on horizontal central axes in the first peripheral region and the second peripheral region and symmetrically arranged;
The step of performing data estimation based on the scan projection data according to a preset rule corresponding to the scan mode to obtain estimated projection data includes:
Calculating a scanning pitch according to the preset relation between the scanning pitch and the size width according to the size width of the low-row number detector;
Performing image reconstruction of the whole scanning area based on the calculated scanning pitch and the acquired scanning projection data to obtain a one-time reconstructed image;
performing image orthographic projection processing on the primary reconstructed image to obtain estimated projection data of the whole scanning area;
The step of performing scan reconstruction on the heart based on the scan projection data and the estimated projection data to obtain a heart reconstruction image comprises the following steps:
And carrying out projection mixing processing on the estimated projection data and the scanning projection data to obtain mixed projection data, and carrying out image reconstruction based on the mixed projection data to obtain a final heart reconstruction image.
In one embodiment, the scan projection data is obtained based on an axial scan detection device, and the estimating the data based on the scan projection data according to a preset rule corresponding to the scan mode to obtain estimated projection data includes:
Performing data interpolation on the missing data in the first peripheral area and the second peripheral area by utilizing a data interpolation mode based on the scanning projection data so as to obtain corresponding estimated projection data;
The step of performing scan reconstruction on the heart based on the scan projection data and the estimated projection data to obtain a heart reconstruction image comprises the following steps:
And carrying out image reconstruction on the scanning projection data and the estimated projection data according to a filtered back projection reconstruction mode to obtain a heart reconstruction image.
Embodiments of the present application also provide a readable storage medium storing a computer program which, when executed by a processor, implements the cardiac CT scan reconstruction method described above.
The embodiment of the application has the following beneficial effects:
The heart CT scanning detection device of the embodiment of the application has the advantages that the structure of the detection device is improved, namely, a plurality of detectors which are arranged continuously are covered in the central area, and a plurality of detectors are covered in the two peripheral areas surrounding the central area, so that the corresponding scanning mode and the corresponding processing mode are adopted, the product cost is greatly reduced on the premise of ensuring that the reconstructed image which meets the requirements is obtained by dirty scanning, the radiation dose is also reduced, and the damage to a patient is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a cardiac CT scanning and detecting device according to an embodiment of the present application;
FIGS. 2a and 2b are two schematic diagrams showing an axial scan configuration of a cardiac CT scanning probe apparatus according to an embodiment of the present application;
FIG. 3 is another schematic view of an axial scan configuration of a cardiac CT scanning probe device according to an embodiment of the present application;
FIGS. 4a and 4b show two schematic views of a spiral structure of a cardiac CT scanning detection device according to an embodiment of the present application;
FIG. 5 is a flow chart of a cardiac CT scan reconstruction method according to an embodiment of the present application;
FIG. 6 is a schematic flow chart of a method for reconstructing cardiac CT scan based on an axial scan mode according to an embodiment of the present application;
FIG. 7 is a schematic flow chart of a spiral scan mode based cardiac CT scan reconstruction method according to an embodiment of the present application;
Fig. 8a and 8b show a schematic calculation diagram and a schematic mixed projection diagram of a scan pitch of a cardiac CT scan reconstruction method according to an embodiment of the present application;
FIGS. 9a to 9c are diagrams showing a test and comparison of a reconstructed image obtained by using different reconstruction methods for each of a cardiac CT scanning and detecting apparatus and a conventional cardiac CT detecting apparatus according to the present embodiment;
Fig. 10a to 10c are schematic diagrams showing another test comparison of a cardiac CT scanning probe apparatus and a conventional cardiac CT probe apparatus according to the present embodiment, each of which obtains a reconstructed image by using a different reconstruction method.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments.
The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
The terms "comprises," "comprising," "including," or any other variation thereof, are intended to cover a specific feature, number, step, operation, element, component, or combination of the foregoing, which may be used in various embodiments of the present application, and are not intended to first exclude the presence of or increase the likelihood of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the application belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having a meaning that is the same as the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in connection with the various embodiments of the application.
Example 1
Fig. 1 is a schematic structural diagram of a cardiac CT scanning detection device according to an embodiment of the present application.
The cardiac CT scanning detection device comprises a first detector assembly, a second detector assembly and a third detector assembly, wherein the first detector assembly is arranged in a central area, and the second detector assembly and the third detector assembly are respectively and correspondingly arranged in a first peripheral area and a second peripheral area on two sides of the central area.
In this embodiment, the central region will correspond to a cardiac scan region and the two peripheral regions will correspond to a body surrounding region outside the heart. The first detector assembly includes a plurality of detectors disposed in series that will be used to completely cover the central region; the second detector component and the third detector component respectively comprise a plurality of detectors which are arranged continuously or at intervals so as to partially cover the corresponding peripheral areas, namely the second detector component partially covers the first peripheral area, and the third detector component partially covers the second peripheral area.
Alternatively, the shape of the central region may be a symmetrical design structure in the axial direction, for example, may be rectangular, may be a symmetrical hexagon, or the like, and is not particularly limited herein. It will be appreciated that the hexagonal symmetrical design described above is essentially a rectangular design with four corners removed, i.e. no detector covered around the corners, which allows for a reduced radiation dose to the patient at a further reduced cost.
It will be appreciated that during the scanning process, the detector in the central region can always be used to perform a complete scan of the heart to obtain complete projection data of the heart region. However, for data around the body other than the heart, only partial projection data can be obtained since the detectors in the two peripheral regions are partially covered. In contrast, in this embodiment, data estimation (also referred to as data recovery) is performed using actual projection data obtained by scanning, so that scanning information including the heart and the area around the heart is obtained.
In one embodiment, the first detector assembly described above may be implemented with a high number of rows of detectors arranged in series. The first detector assembly illustratively includes a plurality of high-row-number detectors disposed horizontally in succession and side-by-side above one another.
The number of rows of the high-row-number detector may vary according to the configuration of each manufacturer, for example, the number of rows may be 128 rows, 256 rows, etc. which are commonly used in cardiac CT. It will be appreciated that the number of rows of the high-row-number detector should be greater than the number of rows of the low-row-number detector mentioned later, and that the number of rows of the high-row-number detector is not strictly limited.
And for the second detection component and the third detection component, the arrangement modes of the second detection component and the third detection component in the corresponding peripheral areas are different, so that scanning detection devices with different structures are formed, and for the scanning detection devices with different structures, the corresponding scanning modes are configured for the scanning detection devices to scan, so that the CT scanning reconstruction result meeting the requirements can be obtained, and the patient dosage can be reduced.
In one embodiment, the second detecting component and the third detecting component may be implemented by a plurality of detectors arranged at intervals, and the obtained scanning detecting device will perform scanning in an axial scanning mode, so that the scanning detecting device is also called an axial scanning detecting device. The second and third detection assemblies illustratively include a low number of rows of detectors positioned on a horizontal central axis and a plurality of high number of rows of detectors spaced apart in a direction perpendicular to the horizontal central axis, respectively.
For example, the plurality of high-row-number detectors may be arranged symmetrically up and down along the horizontal central axis, as shown in fig. 2 a. Alternatively, the plurality of high-row-number detectors may be staggered up and down along the horizontal central axis, as shown in fig. 2 b. Alternatively, the number of high-row number detectors in the second and third detection assemblies may or may not be equal. Further, the position of each high-row-number detector in the second detection assembly may be complementary to the position of each high-row-number detector in the third detection assembly to form a scanning area.
In one embodiment, the number of rows of the low-row-number detector may be less than 128, such as 32 rows, 64 rows, etc., which is not strictly limited herein.
In another embodiment, the second and third detection assemblies may also be implemented with high-row number detectors arranged in series, but unlike the first detection assembly, the first detection assembly will entirely cover the central region, while the second and third detection assemblies partially cover the peripheral regions where they are located. For example, the second detecting unit and the third detecting unit respectively include a group of high-row-number detectors disposed continuously along the horizontal central axis and located at one side of the horizontal central axis, such as two groups of high-row-number detectors shown in the lower left corner and the upper right corner of fig. 3, which are diagonally symmetrical with respect to the central region as the origin. Of course, the two sets of high-rank detectors may also be disposed in the upper left and lower right corners, which is not limited herein. The scanning detection device obtained at this time can also adopt an axial scanning mode for scanning, so the scanning detection device is also called an axial scanning detection device.
In this embodiment, the axial scan mode refers to an axial scan (also referred to as a circumferential scan) around the heart. For example, the axial scanning detection device can be used to scan a circle in a circular region located about 20cm from the heart, and the whole central region is covered with a high-row number of detectors, so that the whole scanning data of the heart region can be obtained, while the body region other than the heart is not in a moving state like the heart, so that the general information of the scanning data can be recovered only by a small number of detectors, and the cardiac CT scanning reconstruction can be performed after estimating the data.
As another alternative embodiment, a spiral type scanning probe device may be constructed in addition to the axial scanning type scanning probe device described above. The second detection assembly and the third detection assembly each comprise only one low-row number detector on the horizontal central axis based on the first detection assembly, and the two low-row number detectors are symmetrically arranged with the central area as an origin. For example, when the central area is rectangular, the two low-row number detectors are respectively located at two sides of the rectangle and have identical structures, as shown in fig. 4 a; alternatively, the central area may be hexagonal, so that a scanning probe device as shown in fig. 4b is obtained.
It can be understood that when heart scanning is performed, the spiral scanning detection device adopts a spiral scanning mode, namely, a sickbed horizontally placed moves at a constant speed and simultaneously the scanning detection device also rotates at a constant speed, so that spiral scanning is formed. Generally, a low-pitch (e.g., 0.2-0.3) scanning mode can be used to scan a patient, and at this time, other areas except the heart can be reconstructed, and a good heart reconstruction result can be obtained because the detector of the heart area is covered by a full size.
The cardiac CT scanning detection device of the embodiment is improved in structure, namely, a plurality of continuously arranged detectors are covered in the central area, and some detectors are partially covered in two peripheral areas surrounding the central area, so that the corresponding scanning mode and the processing mode are adopted, the product cost is greatly reduced, the radiation dose is also reduced, the damage to a patient is reduced, and the like on the premise of ensuring that a reconstructed image which meets the requirements is obtained through dirty scanning.
Example 2
Fig. 5 is a flowchart of a cardiac CT scan reconstruction method according to an embodiment of the present application.
In this embodiment, by performing corresponding processing on the scan projection data acquired by the cardiac CT scan detection apparatus according to embodiment 1, a better cardiac scan reconstruction result can be obtained.
The cardiac CT scan reconstruction method illustratively includes:
Step S110, the heart is scanned by using a heart CT scanning detection device according to a corresponding scanning mode, and scanning projection data are obtained.
The cardiac CT scanning probe apparatus may be exemplified by the spiral scanning probe apparatus or the axial scanning probe apparatus of embodiment 1 described above, and accordingly, scanning projection data in the corresponding scanning mode will be acquired. It will be appreciated that there will be differences in the projection data obtained due to the different placement of the detector and the different scanning patterns.
Step S120, performing data estimation according to a preset rule corresponding to the above scanning mode based on the scanned projection data, to obtain estimated projection data.
The preset rule corresponding to the scanning mode may be stored in advance, for example, for the axial scanning mode, the preset rule may be to recover the missing data in the two peripheral areas by using a data interpolation mode. Or for the spiral scanning mode, the preset rule can be that full-view field reconstruction is firstly carried out, then orthographic projection processing is carried out on the reconstructed image, and projection data missing in two peripheral areas can be estimated and obtained.
And step S130, carrying out scanning reconstruction on the heart based on the scanning projection data and the estimated projection data to obtain a heart reconstruction image.
Because the number of detectors in the peripheral region is reduced, there is a lack of projection data, and in order to obtain a complete reconstructed image, the embodiment performs corresponding data estimation processing (i.e., data recovery) on the obtained actual projection data, so that the estimated data and the projection data obtained in practice can be used to reconstruct a final cardiac scan image.
The following describes specific reconstruction steps in the axial scan mode and the helical scan mode, respectively.
In one embodiment, if the scan projection data is obtained based on the axial scan scanning probe apparatus, as shown in fig. 6, the above step S120 and step S130 may include:
step S210, carrying out data interpolation on the missing data in the first peripheral area and the second peripheral area by utilizing a data interpolation mode based on the scanning projection data so as to obtain corresponding estimated projection data. Step S220, performing image reconstruction on the scanned projection data and the estimated projection data according to a filtered back projection reconstruction mode, so as to obtain a heart reconstruction image.
For example, the structure shown in fig. 2a is illustrated, in which the projected coordinate system is defined as the U-axis in the horizontal direction and the V-axis in the vertical direction, and then the data interpolation is as follows:
Pest(u,v,n)＝P(u1,v,n)w1+P(u2,v,n)w2；
wherein, w2＝1-w1。
Wherein P est (U, v, n) represents the nth projection data with coordinates (U, v) obtained by interpolation calculation, w 1 and w 2 are respectively corresponding weight values, U 1 is the position with the detector data adjacent to the position closest to U on the U axis, U 1≤u;u2 is the position with the detector data adjacent to the position closest to U on the U axis, and U 2 is larger than or equal to U.
It will be appreciated that one or more interpolation data may be calculated between two adjacent detectors (u 1 and u 2) by the above formula, whereby a plurality of projection data for positions within the two peripheral regions not covered by a detector may be obtained. And finally, performing image reconstruction by using the obtained actual projection data and the estimated projection data in a mode of filtering back projection reconstruction (FBP) and the like, and obtaining a heart scanning reconstruction image. For the FBP algorithm, reference is made to the existing relevant literature, and no description will be presented here.
In another embodiment, if the scan projection data is obtained based on a spiral scan detection apparatus, as shown in fig. 7, for example, the steps S120 and S130 may include:
step S310, calculating a scanning pitch according to a preset relation between the scanning pitch and the size width according to the size width of the low-row number detector positioned on the horizontal central axis; step S320, performing image reconstruction of the whole scanning area based on the calculated scanning pitch and the acquired scanning projection data to obtain a one-time reconstructed image; step S330, performing image orthographic projection processing on the one-time reconstructed image to obtain projection data of the whole scanning area; step S340, performing projection mixing processing on the estimated projection data and the scanned projection data to obtain mixed projection data; and step S350, performing image reconstruction based on the mixed projection data to obtain a final heart reconstruction image.
Typically, the pitch of the cardiac scan is denoted as p o, and typically, the cardiac scan pitch is relatively low, for example, may be set to 0.2 to 0.3. As shown in fig. 8a, if the full-size width of the high-row-number detector in the z-direction in the central area is w o, and the size width of the low-row-number detector in the z-direction in the peripheral area is w c, the following relationship is satisfied for the scanning pitch p c corresponding to the area w c:
It will be appreciated that, using the calculated new pitch p c and the projection data of the peripheral region obtained by helical scanning, an image of the whole scanning region can be reconstructed using the FBP algorithm or iterative algorithm, and this is referred to as a reconstructed image img full. It will be appreciated that since the heart is constantly beating, the image of the heart constructed by FBP or the like is blurred and therefore requires further processing to obtain a clear reconstructed image of the heart.
In this regard, the primary reconstructed image img full is subjected to image forward projection processing, for example, pixel tracking, ray tracing, or the like, so as to obtain the total projection data of the scan region, including the estimated projection data P fp (u, v, n) of the peripheral region except the central region. Finally, projection mixing processing is performed on the estimated projection data P fp (u, v, n) and the scanned projection data P (u, v, n) to obtain mixed projection data, as shown in fig. 8b, and image reconstruction is performed based on the mixed projection data, for example, using an FBP method, etc., so as to obtain a final cardiac reconstruction image.
In order to better embody the effects of the embodiments of the present application, two tests are used for comparison, as shown in fig. 9a to 9c and fig. 10a to 10c, where fig. 9a and 10a are both reconstructed images obtained by using the detection device of the embodiments of the present application and using a conventional reconstruction method; FIGS. 9b and 10b are views each showing a reconstructed image obtained by using the detection apparatus according to the embodiment of the present application and by using the reconstruction method according to the embodiment; fig. 9c and 10c each show a reconstructed image obtained by a conventional scanning device and a conventional reconstruction method. The two groups of test comparison results show that the improved scheme of the detector structure provided by the embodiment of the application can be combined with a new reconstruction processing method to effectively reduce the product cost on the basis of obtaining satisfactory image quality.
The application also provides a readable storage medium storing a computer program which, when executed by a processor, implements the cardiac CT scan reconstruction method of the above embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, of the flow diagrams and block diagrams in the figures, which illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules or units in various embodiments of the application may be integrated together to form a single part, or the modules may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a smart phone, a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application.
Claims (2)
1. A cardiac CT scan reconstruction method, comprising:
Scanning the heart by using a spiral scanning detection device according to a corresponding scanning mode to obtain scanning projection data; the spiral scanning detection device comprises a first detector assembly, a second detector assembly and a third detector assembly, wherein the first detector assembly is arranged in a central area, the second detector assembly and the third detector assembly are respectively arranged in a first peripheral area and a second peripheral area which are arranged on two sides of the central area, and the central area corresponds to a heart scanning area; the second detection assembly and the third detection assembly only comprise a low-row number detector positioned on a horizontal central axis, and the two low-row number detectors are symmetrically arranged by taking the central area as an origin;
Performing data estimation according to a preset rule corresponding to the scanning mode based on the scanning projection data to obtain estimated projection data;
performing scanning reconstruction on the heart based on the scanning projection data and the estimated projection data to obtain a heart reconstruction image;
the data estimation is performed according to a preset rule corresponding to the scanning mode based on the scanning projection data to obtain estimated projection data, and the method comprises the following steps:
Calculating a scanning pitch according to the preset relation between the scanning pitch and the size width according to the size width of the low-row number detector; performing image reconstruction of the whole scanning area based on the calculated scanning pitch and the acquired scanning projection data to obtain a one-time reconstructed image; performing image orthographic projection processing on the primary reconstructed image to obtain estimated projection data of the whole scanning area;
The step of performing scan reconstruction on the heart based on the scan projection data and the estimated projection data to obtain a heart reconstruction image comprises the following steps:
And carrying out projection mixing processing on the estimated projection data and the scanning projection data to obtain mixed projection data, and carrying out image reconstruction based on the mixed projection data to obtain a final heart reconstruction image.
2. A readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the cardiac CT scan reconstruction method according to claim 1.
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